Method for preparing zno varistor ceramics by co-doping aluminum, gallium and yttrium ions

A varistor and co-doping technology, which is applied in the field of materials, can solve the problems of ZnO varistor valves that have not yet achieved aging performance, and achieve the effects of improving aging stability, leakage current suppression, and inflection point voltage improvement

Active Publication Date: 2020-07-28
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing published formulations and processes have been able to prepare ZnO varistor valves with high gradient or low residual pressure, the combination of different formulations and processes will lead to unpredictable performance changes. ZnO varistor valve with excellent residual pressure and aging performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Raw material preparation

[0024] The low residual voltage ZnO varistor ceramic material is in the following ratio ZnO (90mol%), Bi 2 o 3 (1.5mol%), Sb 2 o 3 (1mol%), MnO 2 (1mol%), Cr 2 o 3 (1mol%), Co 2 o 3 (1mol%), SiO 2 (1.5mol%), Al(NO 3 ) 3 (1mol%), Ga(NO 3 ) 3 (1mol%) and Y(NO 3 ) 3 (1mol%) to prepare starting materials.

[0025] 2) Preparation of auxiliary addition slurry

[0026] Bi 2 o 3 (1.5mol%), Sb 2 o 3 (1mol%), MnO 2 (1mol%), Cr 2 o 3 (1mol%), Co 2 o 3 (1mol%) and SiO 2 (1.5mol%) was put into the ball mill jar of planetary ball mill, added the deionized water of 1.5 times of powder weight, ball milled for 8 hours.

[0027] 3) Mix the auxiliary additive slurry with ZnO

[0028] Add 90% mol of ZnO to the auxiliary slurry after ball milling, add deionized water 1.5 times the weight of the powder, and mix and ball mill all the mixed materials for 8 hours until they are uniformly dispersed.

[0029] 4) Add aluminum, gallium and y...

Embodiment 2

[0043] 1) Raw material preparation

[0044] The low residual voltage ZnO varistor ceramic material is in the following ratio ZnO (95.8mol%), Bi 2 o 3 (0.5mol%), Sb 2 o 3 (0.5mol%), MnO 2 (0.5mol%), Cr 2 o 3 (0.5mol%), Co 2 o 3 (0.5mol%), SiO 2 (1mol%), Al(NO 3 ) 3 (0.1mol%), Ga(NO 3 ) 3 (0.1mol%) and Y 2 o 3 (0.5 mol%) to prepare starting materials.

[0045] 2) Preparation of auxiliary addition slurry

[0046] Bi 2 o 3 (0.5mol%), Sb 2 o 3 (0.5mol%), MnO 2 (0.5mol%), Cr 2 o 3 (0.5mol%), Co 2 o 3 (0.5mol%), SiO 2 (1mol%) is put into the ball mill jar of planetary ball mill, adds the deionized water of 1.5 times of powder weight, ball mills 10 hours.

[0047] 3) Mix the auxiliary additive slurry with ZnO

[0048] Add 95.8% mol of ZnO to the auxiliary slurry after ball milling, add deionized water 1.5 times the weight of the powder, and mix and ball mill all the mixed materials for 10 hours until they are uniformly dispersed.

[0049] 4) Add aluminum, g...

Embodiment 3

[0063] 1) Raw material preparation

[0064] The low residual voltage ZnO varistor ceramic material is in the following ratio ZnO (87.5mol%), Bi 2 o 3 (2mol%), Sb 2 o 3 (1.5mol%), MnO 2 (1mol%), Cr 2 o 3 (1mol%), Co 2 o 3 (1.5mol%), SiO 2 (2mol%), Al(NO 3 ) 3 (1mol%), Ga(NO 3 ) 3 (1mol%) and Y(NO 3 ) 3 (1.5 mol%) to prepare the starting material.

[0065] 2) Preparation of auxiliary additives for ball milling

[0066] Bi 2 o 3 (2mol%), Sb 2 o 3 (1.5mol%), MnO 2 (1mol%), Cr 2 o 3 (1mol%), Co 2 o 3 (1.5mol%) and SiO 2 (2mol%) was put into the ball mill jar of planetary ball mill, added the deionized water of 1.5 times of powder weight, and ball milled for 10 hours.

[0067] 3) Mix the auxiliary additive slurry with ZnO

[0068] Add 87.5% mol of ZnO to the auxiliary slurry after ball milling, add deionized water 1.5 times the weight of the powder, and mix and ball mill all the mixed materials for 10 hours until they are uniformly dispersed.

[0069] 4) ...

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PUM

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Abstract

Belonging to the field of materials, the invention discloses a method for preparation of ZnO varistor ceramic by common doping of aluminum, gallium and yttrium ions. The method includes the preparation steps of: mixing Bi2O3, Sb2O3, MnO2, Cr2O3, Co2O3 and SiO2, adding deionized water and conducting ball-milling; adding ZnO and deionized water into the ball milled slurry, and performing ball milling again; adding Al(NO3)3, Ga(NO3)3, Y(NO3)3 or Y2O3 into the ball milled ZnO slurry, and conducting ball milling again; and subjecting the ball milled slurry to tabletting sintering. The varistor ceramic prepared by the method provided by the invention has the characteristics of small leakage current, high gradient, low residual voltage, large current capacity and stable aging performance, and is more suitable for the application requirements of power transmission line lightning arrester and GIS lightning arrester, and depth limit power system overvoltage.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a method for preparing ZnO varistor ceramics with high gradient and low residual voltage characteristics by co-doping aluminum, gallium and yttrium ions. Background technique [0002] ZnO varistor is made of ZnO as the main raw material, adding a small amount of Bi 2 o 3 , Sb 2 o 3 , MnO 2 、Cr 2 o 3 、Co 2 o 3 , and silver glass powder as auxiliary components, prepared by ceramic sintering process. Due to its excellent nonlinear volt-ampere characteristics and energy absorption capacity, the arrester with it as the core device is the key protection equipment of the power system, and it is the key equipment for the lightning overvoltage protection of the power system and the insulation coordination of power equipment. [0003] Generally, the voltage of the varistor under the action of 1mA DC current is called the varistor voltage U 1mA , the varistor voltage per unit height is ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor 何金良谢清云胡军蒙小记赵洪峰王锋林震
Owner TSINGHUA UNIV
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